Welding method and arrangement useable for a hollow structure, for example a container or a tube, with the introduction of inert gas in the inner room

摘要

The process involves bringing two parts into contact with each other so as to form an unwelded hollow structure defining an internal volume. The internal volume is inerted by introducing an inerting gas mixture into the hollow structure and then welding the two parts together. The gas mixture comprises from 93% to 99.8% nitrogen and the rest oxygen and is produced by air permeation by membrance modules.